Electric meter.



No. 67l,283. Patented-Apr. 2, I90L E. J. KING. ELECTRIC METER. mg li acion filed Jam 81, 1901.

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No. 67| ,283. Patented Apr 2, 190i. E. J. ,Kmn.

ELECTRIC METER.

. (Applicafion ma Jan. 31, 1901. (No Model.) 2 Sheets-Sheet 2.

Fig. 2.

ELTON J. KING, OF FORT WAYNE, INDIANA, ASSIGNOR TO GENERAL ELECTRIC COMPANY, OF NEW YORK,

ELECTRICMETER.

SPECIFICATIONforming part of Letters Patent No. 671,283, dated April 2,1901. Application filed Januaryfil, 1961. Serial No. 45,502- (No model.)

To aZZ whom it may concern:

Be it known that I, ELTON J. KING, a citizen of the United States, residing at Fort Wayne, county of Allen, Stateof Indiana, have invented certain new and useful Improvements in Electric Meters, (Case No. 1,688,) of which the following is a specification.

My invention relates to alternating-current electric meters, and has for its object to provide such a meter with a simple adjustment, by means of which it may be readily adapted for circuits'supplied with currents of differ ent frequincies.

I have illustrated myinvention as applied inductive load. If, however, the windings of such a meter are so proportioned that the.

proper phase relation exists when the meter is connected to a circuit supplied with current of one frequency the relation will be something other than ninety degrees when the meter is connected to a circuit supplied with current of a widely-diiferent frequency, and therefore a meter which is designed for one frequency will not give an accurate registration on a circuit carrying currents of a widely-difierent frequency.- When, therefore, two different frequencies are used in a distribution systemas, for example, when high-frequency currents are used for lighting purposes and currents of low frequency for motive powerit is necessary to employ two different classes of meters, one designed for the high frequency and the other for the low.

By the use of my invention the same meter may be used for currents of either frequency. This result is accomplished by so arranging the shunt-windings of the meter that by the manipulation of a simple switch they may be caused to produce a fieldhaving the required phase displacement on either of the frequencies. Such an arrangement presents very considerable advantages not only when two different frequencies are employed in the same system, but also when, as is often the case,it is desired to change over a high-frequencysystem to one of low frequency. In this case .the inet'ers if constructedin accordancewith my invention, may be adapted for the new frequency by a simple mechanical mahipulatiomwhereas with the constructions heretofore used it is necessary to removethe meters from the circuits and either replace them byothers having their windings adapted for the lowerfrequencyorelse rearrange their windings and recalibrate them for the new frequency at which they are to be operated. My invention will be better understood by reference to the following. description, taken in connection with the accompanying drawings, in which i x r Figure l is a vertical sectional view of the complete meter. Fig. 2 is a horizontal sectional View along the line 2 2 of Fig.1. 3 is a diagram showing the arrangement of the shunt-windings of the meter. Fig. 4 is a diagram showing the phase relation of the field due to the main shunt-windings with reference to the electro motive force of the line on a circuit supplied with current of a certain predetermined-frequency, and Fig. 5 is a diagram showing the effect of the adjusting devicewhen the same meter is connected to a circuit of low frequency.

i The mechanism of the meter which I have illustrated is mounted on a base B, from which brackets extend both at the top and bottom, carrying the bearings ofa shaft 1, upon which a cup-armature A is mounted. The shaft is connected through the usual gearing (not shown) with the registering mechanism R. The actuating-windings for,

the'armature A comprise two series coils S S and shunt-coils 2and 3, together with an auxiliarywinding 4:. On the side of the armature away from the actuating-windings is mounted a retarding-magnet M, having its Fig.

pole-pieces curved to include the depending The series Fig. 5. It will be noted that this line does not lie at rightangles to the line 0 00,.and therefore it will be evident that the meter will not register accurately the energy consumed in the circuit to which it is connected. In order to increase the angle between the lines 0 0c and 0 a on the lower frequency, I provide an auxiliary winding 4 in inductive relation to the winding 2,and in the circuit with this winding I arrange a regulable resistance r and aswitch 15, by means of which the winding may be short-circuited on itself. By closing this switch 15 when the motor is connected to the low-frequency circuits there is produced a new component in the magnetizations that go to make up the resultant shunt-field, this component having a phase relation, (indicated by the line 0 b in Fig. By properly choosing the resistance of the circuit including the winding 4 it is evident that the resultant shunt-field may be shifted to exactly ninety degrees behind the im pressed electromotive force, as represented by the line 0 c, Fig. 5.

The meter is of course calibrated on a highfrequency circuit, with the adjusting-switch in proper position for high frequency and on a low-frequency circuit with the said switch in its proper position for low frequency, so

that in installing the meter it is only necessary to move the adjusting device or switch into the position corresponding to the frequency of the circuit to which it is to be connected.

While I have shown in the drawings the meter-windings so organized that the component 0 b necessary at the low frequency is produced by a winding separate from the windings which are utilized for producing the shunt-field at high frequency, I desire it to be understood that my invention is not limited to this particular arrangement ofwindings, but consists, broadly, in the provision of an adjusting device or switch for changing the character of the shunt-winding as an entirety, so that with the switch in one position the meter will be adapted to circuits of a particular frequency and in another position to circuits of a widely-different frequency, and although I have illustrated a switch for making the required changes in the circuit connections it will be understood that an actual switch is not necessary. For example, in the arrangement shown instead of providing the terminals of the winding 4 with a switch the ends of the wire constituting the winding may be left free, so that they may be soldered together when it is desired to adapt the meter for the lower frequency.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. An alternating-current meter provided with an adjusting device for changing the character of the shuntwinding to adapt the meter for currents of widely-varied frequencies.

2. In an alternating-current meter having itsshunt-winding suitably arranged for cur rents of a predetermined frequency, an ad: justing device for changing the character of the shunt-winding to adapt the meter for a current of a widely-different frequency.

3. An alt-ernating-current meter calibrated for a plurality of frequencies, and adjusting means having different operative positions corresponding to the different frequencies.

4. A meter calibrated for a plurality of frequencies, and an adjusting-switch having an operative position corresponding to each of the frequencies for which the meter is calibrated.

5.- In a meter calibrated for two diiferent frequencies, a single circuit connection which when open adapts the meter for currents of one. frequency and when closed adapts the meter for currents of the other frequency.

6'. In combination in an electric meter for alternating currents, means for producing a series field, means for producing a shunt-field displaced by substantially ninety degrees from the series field, on non-inductive load, at a specified frequency, an armature acted upon by said fields and auxiliary means for modifying the phase of the shunt-field when the meter is supplied with currents of adiifer- 8. In combination, in an electric meter for alternating currents, a series winding, a shunt-winding, means cooperating therewith to produce a shunt-field displaced by substantially ninety degrees from the series field, ata predetermined frequency, on non-inductive load, an armature in inductive relation to said windings, an auxiliary winding arranged to cooperate with the main shuntwinding, and means for closing the circuit of said auxiliary winding to adapt the meter for a different frequency.

9. In combination in an electric meter for alternating currents, a series winding, a main shunt-winding, means for causing the current in said main shunt-winding to lag behind the impressed electromotive force,a second shuntwinding cooperating with the main shuntwinding to produce a resultant tieldlagging by substantially ninety degrees behind the series field, on non-inductive load, at a predetermined frequency, and auxiliary adjustof a difierent frequency.

IIO

10. In combination in an electric meter for alternating currents, a series winding, a main shi1nt-Winding,means for causing the current in said main shunt-Winding to lag behind the determined frequency,andan auxiliary Wind- 1'6 ing arranged to produce a ninety-degree relation at a different frequency. v a

In witness whereof I have hereunto set my impressed electrornotive force,asecond shunthand this 28th dayof January, 1901. Winding eoijperating with the main shuntwinding to produce a resultant field lagging by substantially ninety degrees behind the series field, n non-inductive load, at a pre- 7 ELTON J. KING;

-Witnessesi W. S. MAY, D. S. MYERS. 

